Create Hyperlinks that Run Functions

The special keyword matlab: lets you embed commands in other functions. Most commonly, the functions that contain it display hyperlinks, which execute the commands when you click the hyperlink text. Functions that support matlab: syntax include disp, error, fprintf, help, and warning.

Use matlab: syntax to create a hyperlink in the Command Window that runs one or more functions. For example, you can use disp to display the word Hypotenuse as an executable hyperlink as follows:

disp('<a href="matlab:a=3; b=4;c=hypot(a,b)">Hypotenuse</a>')

Clicking the hyperlink executes the three commands following matlab:, resulting in

c =
     5

Executing the link creates or redefines the variables a, b, and c in the base workspace.

The argument to disp is an <a href> HTML hyperlink. Include the full hypertext string, from '<a href= to </a>' within a single line, that is, do not continue a long string on a new line. No spaces are allowed after the opening < and before the closing >. A single space is required between a and href.

You cannot directly execute matlab: syntax. That is, if you type

matlab:a=3; b=4;c=hypot(a,b)

you receive an error, because MATLAB® interprets the colon as an array operator in an illegal context:

??? matlab:a=3; b=4;c=hypot(a,b)
            |
Error: The expression to the left of the equals sign 
       is not a valid target for an assignment.

You do not need to use matlab: to display a live hyperlink to the Web. For example, if you want to link to an external Web page, you can use disp, as follows:

disp('<a href="http://en.wikipedia.org/wiki/Hypotenuse">Hypotenuse</a>')

The result in the Command Window looks the same as the previous example, but instead opens a page at en.wikipedia.org:

Hypotenuse

Using matlab:, you can:

Run a Single Function

Use matlab: to run a specified statement when you click a hyperlink in the Command Window. For example, run this command:

disp('<a href="matlab:magic(4)">Generate magic square</a>')

It displays this link in the Command Window:

When you click the link, MATLAB runs magic(4).

Run Multiple Functions

You can run multiple functions with a single link. For example, run this command:

disp('<a href="matlab: x=0:1:8;y=sin(x);plot(x,y)">Plot x,y</a>')

It displays this link in the Command Window:

When you click the link, MATLAB runs this code:

x = 0:1:8;
y = sin(x);
plot(x,y)

Redefine x in the base workspace:

x = -2*pi:pi/16:2*pi;

Click the hyperlink, Plot x,y again and it changes the current value of x back to 0:1:8. The code that matlab: runs when you click the Plot x,y defines x in the base workspace.

Provide Command Options

Use multiple matlab: statements in a file to present options, such as

disp('<a href = "matlab:state = 0">Disable feature</a>')
disp('<a href = "matlab:state = 1">Enable feature</a>')

The Command Window displays the links that follow. Depending on which link you click, MATLAB sets state to 0 or 1.

Include Special Characters

MATLAB correctly interprets most strings that include special characters, such as a greater than symbol (>). For example, the following statement includes a greater than symbol (>).

disp('<a href="matlab:str = ''Value > 0''">Positive</a>')

and generates the following hyperlink.

Some symbols might not be interpreted correctly and you might need to use the ASCII value for the symbol. For example, an alternative way to run the previous statement is to use ASCII 62 instead of the greater than symbol:

disp('<a href="matlab:str=[''Value '' char(62) '' 0'']">Positive</a>')
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